名詞 clamp down:

1. sudden restriction on an activity
   同義詞：clampdown

動詞 clamp down:

1. repress or suppress (something regarded as undesirable)
   同義詞：crack down

1. The Government intends to clamp down on soccer hooliganism.
   政府擬采取措施嚴禁在足球比賽中鬧事。
2. After the explosion, police clamped down and let no more visitors inside the building.
   爆炸之后，警方嚴格制止任何參觀者進入該建筑。